I just experienced the following reproducible issue with the mobile app on Android:
Open some login page of a website where your credentials are not stored in bitwarden
Click on the password field and select the pop-up to fill with bitwarden
The app opens, unlock the vault
No matching entry is found, click on the provided button to create a new entry
Click on the “generate passwort” button next to the password field
The app closes immediately (and the vault is locked)
I observed this behavior both with Firefox and Chrome on Android.
When opening the app directly and taping the plus button to create a new entry everything works as expected and the password generator opens without crashing.